Barack Obama

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** FILE ** Gen. David Petraeus testifies on Capitol Hill in Washington on Tuesday, June 29, 2010, before the Senate Armed Services Committee hearing to be confirmed as President Obama's choice to take control of forces in Afghanistan. (AP Photo/Pablo Martinez Monsivais)

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Gen. David Petraeus testifies on Capitol Hill in Washington, Tuesday, June 29, 2010, before the Senate Armed Services Committee hearing to be confirmed as President Obama's choice to take control of forces in Afghanistan. (AP Photo/Pablo Martinez Monsivais)

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** FILE ** In this May 21, 2010, photo, Rep. Barney Frank (left), Massachusetts Democrat, who chairs the House Financial Services Committee, and Sen. Christopher J. Dodd, Connecticut Democrat, who is Senate Banking Committee chairman, speak to reporters outside the White House after meeting with President Obama on banking-overhaul legislation. (AP Photo/Susan Walsh, File)

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President Obama walks across the tarmac with Chief of Protocol Robert William Peck, as he arrives at Pearson International Airport in Toronto, Friday, June 25, 2010, for the G-8 and G-20 summit. (AP Photo/Carolyn Kaster)

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President Obama walks toward the podium on the South Lawn of the White House in Washington, Friday, June 25, 2010, to speak to members of the media before traveling to attend the G-20 summit in Canada. (AP Photo/Pablo Martinez Monsivais)

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From left, National Security Adviser James Jones, White House Chief of Staff Rahm Emanuel and White House press secretary Robert Gibbs, listen to President Obama speak to members of the media on the South Lawn of the White House in Washington, Friday, June 25, 2010, before traveling to Canada to attend the G-20 summit. (AP Photo/Pablo Martinez Monsivais)

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President Obama speaks to members of the media on the South Lawn of the White House in Washington, Friday, June 25, 2010, before departing to Canada to attend the G-20 summit. (AP Photo/Pablo Martinez Monsivais)

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Treasury Secretary Timothy Geithner watches from the West Wing Colonnade of the White House in Washington, Friday, June 25, 2010, as President Obama speaks to members of the media, prior to traveling to Canada to attend the G-20 summit. (AP Photo/Pablo Martinez Monsivais)

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President Obama returns a salute prior to boarding Air Force One at Andrews Air Force Base, Md., Friday, June 25, 2010, prior to traveling to Canada for the G-20 summit. (AP Photo/Charles Dharapak)

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President Obama boards Air Force One at Andrews Air Force Base, Md., Friday, June 25, 2010, en route to Canada for the G-20 summit. (AP Photo/Charles Dharapak)

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President Obama greets unidentified officials upon his arrival in Toronto, Friday, June 25, 2010, for the G-20 summit. (AP Photo/Charles Dharapak)

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President Obama is greeted upon his arrival in Toronto, Friday, June 25, 2010, for the G-20 summit. (AP Photo/Charles Dharapak)

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President Obama is greeted on the tarmac by David Jacobson, the U.S. ambassador to Canada, left, Chief of Protocol Robert William Peck, second from left, and U.S. Consul General Kevin Johnson, right, as he arrives at Pearson International Airport in Toronto, Friday, June 25, 2010, for the G-8 and G-20 Summit. (AP Photo/Carolyn Kaster)